20"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace - Weather-Resistant Air Grille with Screen Mesh - [Outer Dimensions 21.75"w x 13.75"h] Return Grille with screws included to make 4 X 12 Is CRFG2028 Width_14in

with screws included to make setup quick and hassle-free

Optimized Comfort: By putting airflow control at your fingertips

+ Product Details Perfect Fit & Easy Sizing - Designed for a 12" x 30" or 30" x 12" duct opening (measured at the opening)

+ Product Details Perfect Fit & Easy Sizing - Designed for a 34" x 16" Or 16" x 34" duct opening (measured at the opening)

High Quality – Rigid aluminum construction with counter-sunk screw holes (screws included) and no sharp edges

20"w X 12"h Aluminum Exterior Gable Louver Vent for Walls & Crawlspace Weather Resistant Air Grille with Screen Mesh [Outer Dimensions 21.75"w x 13.75"h] Return Grille with screws included to make 4 X 12 Is CRFG2028 Width_14in with screws included to make setup quick and hassle free Optimized Comfort: By putting airflow control at your fingertips